Summary: SUPPLEMENTARY MATERIALS
1 A schematic model for remapping from color
to location
In the experiment of Sugrue et al. (2004) the rewarding value (baiting prob-
ability) of each target is determined by the target color (red and green) and
not its location. Moreover, the location of red and green targets were as-
signed randomly in each trial. On the other hand, LIP neurons are selective
to target location. So in order for LIP neurons to receive the information
about the rewarding value of each target, a remapping from color to location
should take place in each trial. Here we describe the scheme of a model en-
dowed with a remapping circuit (Fig. 1A). Furthermore, we show how this
model can be reduced to the simple model which we have used in the paper
(Fig. 1B).
The detailed model consists of three layers of neurons (Fig. 1A). The
first layer consists of two populations of neurons which are selective to target
color and receive sensory inputs through some plastic synapses. The second
(intermediate) layer of neurons is responsible for the remapping from color
to location. It consists of two color selective populations of neurons, each
one consisting of two subpopulations which receive input about the location
of each target. Hence, there are four neural subpopulations selective for